Physicochemical Structure of Carburized Thoriated Tungsten and Its Effect on Thermionic Emission

被引：0
|
作者：
Velazquez, Daniel [1 ]
Ohlinger, Wayne [2 ]
Vancil, Bernard [3 ]
Smith, Frank [3 ]
Riordan, Brian [1 ]
Langtry, Robin [1 ]
机构：
[1] Avalanche Energy, 9100 E Marginal Way S, Seattle, WA 98108 USA
[2] POB 506, Babson Pk, FL 33827 USA
[3] eBeam Inc, 21070 SW Tile Flat Rd, Beaverton, OR 97007 USA
来源：
E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY | 2024年 / 22卷 / 03期
关键词：
Fusion reactor; Thermionic emitter; Thoriated tungsten; Space-charge mitigation; Work function; THORIUM;
D O I：
10.1380/ejssnt.2024-022283
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The work presented here aims to optimize parameters for emission current and lifetime based on thermionic, microstructural and chemical characterization. Carburization was performed using toluene in a test structure consisting of a straight 0.006-inch diameter 2% thoria-tungsten wire, tensioned with a leaf spring and concentric to the inner diameter of a 1-inch long, 0.250-inch diameter molybdenum tube serving as the anode for emission testing. Scanning electron microscope/energy dispersive spectroscopy analysis shows the formation of a similar to 5 mu m carburization layer, while thermionic measurements show improved emission over uncarburized thoriated tungsten.
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页码：283 / 286
页数：4
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